HST to SGT Converter
SGT is 18 hours ahead of HST. 9:00 AM HST = 3:00 AM SGT (next day).
SGT is 18 hours ahead of HST. To convert HST to SGT, add 18 hours to the HST time: 9:00 AM HST = 3:00 AM SGT (next day).
HST (Hawaii-Aleutian Time) is used in Hawaii (all year, no daylight saving time). SGT (Singapore Time) is used in Singapore.
HST to SGT time conversion table
HST to SGT on 6 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| HST | SGT | Day |
|---|---|---|
| 12:00 AM HST | 6:00 PM SGT | — |
| 1:00 AM HST | 7:00 PM SGT | — |
| 2:00 AM HST | 8:00 PM SGT | — |
| 3:00 AM HST | 9:00 PM SGT | — |
| 4:00 AM HST | 10:00 PM SGT | night |
| 5:00 AM HST | 11:00 PM SGT | night |
| 6:00 AM HST | 12:00 AM SGT | next day |
| 7:00 AM HST | 1:00 AM SGT | next day |
| 8:00 AM HST | 2:00 AM SGT | next day |
| 9:00 AM HST | 3:00 AM SGT | next day |
| 10:00 AM HST | 4:00 AM SGT | next day |
| 11:00 AM HST | 5:00 AM SGT | next day |
| 12:00 PM HST | 6:00 AM SGT | next day |
| 1:00 PM HST | 7:00 AM SGT | next day |
| 2:00 PM HST | 8:00 AM SGT | next day |
| 3:00 PM HST | 9:00 AM SGT | work hours |
| 4:00 PM HST | 10:00 AM SGT | work hours |
| 5:00 PM HST | 11:00 AM SGT | next day |
| 6:00 PM HST | 12:00 PM SGT | next day |
| 7:00 PM HST | 1:00 PM SGT | next day |
| 8:00 PM HST | 2:00 PM SGT | next day |
| 9:00 PM HST | 3:00 PM SGT | next day |
| 10:00 PM HST | 4:00 PM SGT | next day |
| 11:00 PM HST | 5:00 PM SGT | next day |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert HST to SGT
Add 18 hours to the HST time to get SGT.
Example: 9:00 AM HST = 3:00 AM SGT (next day).
Across midnight: 10:00 PM HST = 4:00 PM SGT (next day). The date changes, so always check the day as well as the hour.
Time difference between HST and SGT
The time difference between HST and SGT is 18 hours all year – SGT is ahead of HST.
HST and SGT during daylight saving time
- HST does not observe daylight saving time; it stays on UTC−10 all year.
- SGT does not observe daylight saving time; it stays on UTC+8 all year.
Best time for a meeting between HST and SGT
HST and SGT have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 1:00 PM HST, which is 7:00 AM SGT.
HST to SGT FAQ
What is the time difference between HST and SGT?
SGT is 18 hours ahead of HST all year. 9:00 AM HST = 3:00 AM SGT (next day).
What is 9 AM HST in SGT?
9:00 AM HST is 3:00 AM SGT (next day).
What is 12 PM (noon) HST in SGT?
12:00 PM HST is 6:00 AM SGT (next day).
Is SGT ahead of or behind HST?
SGT is 18 hours ahead of HST, so it is later in SGT than in HST.
Does HST change for daylight saving time?
No. HST stays on the same offset all year, so conversions never shift for daylight saving time.
Does SGT change for daylight saving time?
No. SGT stays on the same offset all year, so conversions never shift for daylight saving time.
What is the best time for a meeting between HST and SGT?
HST and SGT have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 1:00 PM HST, which is 7:00 AM SGT.
Related conversions
Convert SGT to HST
Convert HST to other time zones
Convert other time zones to SGT
Learn more
Updated 6 November 2026. Time zone data: IANA tz database.